NMFS Openscapes HackHours, July 2025

Part 1: Experimenting with LLM Applications in R - UseR Talk Preview

• See PDF in this repo
• Social media post generator
• Arrow mailing list summariser code

Part 2: {ellmer} basics and structured output

• Get started with ellmer - package vignette
• Working with structured data - {ellmer} vignette

Part 3: LLMs in Shiny

Things to consider:

• Careful prompting helps but doesn't guarantee correct outputs
• Non-deterministic outputs
• LLM hallucinations
• UX and load time
• API usage costs and risk when deployed
• Some models guard against abuse, but it's still not a guarantee

In-development packages by Posit:

• shinychat
• querychat